.clear:after {
  content: ".";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}

.lt {
  float: left;
}

.rt {
  float: right;
}

/* 居中 */
.centerTranslate {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.centerTranslateX {
  left: 50%;
  transform: translate(-50%, 0);
}

.centerTranslateY {
  top: 50%;
  transform: translate(0, -50%);
}

/* 扑克效果 */
.poker {
  transition: all .2s linear;
}

.poker:hover {
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
  transform: translate3d(0, -2px, 0);
}